Hi all, I am in the process of completing the online tourist visa application, and I am unsure what to do about the field asking for additional valid passport / IC details.
I have dual citizenship, but only 1 valid passport (PT), the other passport from my country of birth (US) expired.

So far I had to fill in the following on the application form:
Country of Birth: US
Nationality: PT
Nationality by birth or naturalisation? Naturalisation
Previous Nationality: US
Then it asks you to provide details for another valid passport, if you have one.

If I leave it blank, will they find it odd that I have dual nationality but dont keep the passport from my country of birth, thereby reducing my chances of having my visa approved? Maybe I should just renew my passport ASAP. My trip starts end of December and I really want to get this sorted.
I plan to go to the embassy on Thursday, seeing as unfortunately they are closed tomorrow and no one answers the phone or replies to emails. =/ Hoping someone can help in the meantime. Thanks!^^

There is no information on http://www.indembassy-lisbon.org, so I am sifting through the vfs and travisa sites. I am also trying to call them, but keep getting disconnected even when calling through voipbuster with an unkown number.

I have not found anything useful for my situation yet, but I will copy the contacts and links below in case it helps any one else.

Condition 2: Are you planning to apply on a Foreign Passport? [Non- Australian Passport]
For Non Australian Passport holders, Photocopy of Visa Status showing valid visa OR Residency Proof from DIAC (Department of Immigration and Citizenship) issued within the last 1 month of the current date stating the type of Residency applied for e.g. Bridging Visa A awaiting Permanent Residency
EXCEPTION: For example, if you are a DUAL national – Australia and UK, and wish to apply on your UK passport, submit a copy of the photo page of your Australian
passport.

I actually went to to the Indian Embassy in Lisbon this morning. I was left with the impression that the person I spoke to had not encountered this problem before.

- Their #1 advice was "be honest."
- They said not to include the expired passport #, since the form asks for any other valid passport.
- They said they could not give me a firm answer, but that I could either leave it blank, or, if I had any concerns, just go ahead and renew the expired passport, since the visa only takes 4 working days to process and I still have about 10 weeks before my trip.

I have decided to go with the second "better safe than sorry" option. I was going to renew it anyway at some point, so I might as well do it now since it is valid for 10 years.

Originally Posted by meta
I have decided to go with the second "better safe than sorry" option. I was going to renew it anyway at some point, so I might as well do it now since it is valid for 10 years.

Let me know how many weeks does US Embassy takes to renew your expired passport. I am just curious, if it is faster outside than in-state.